Type-writing machine.



J. c. MoLAUGHLIN. TYPE WRITING MACHINE.

APPLICATION IILED MAB. 12, 1908.

Patented Mar. 8, 1910.

WIT/n ess as UNITED s'rATEs PATEN o Io JOHN C. MQLAUGHLQIN, OF JERSEYCITY, NEW JERSEY, ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK,1\T. Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Application filed March 12, 1908. serial'No. 420,721.

To all whom it may conccrn:

Be it known that I, JOHNO. ABICLAUGH- LIN, a citizen of the UnitedStates, residing in Jersey City, in the county of Hudson and State ofNew Jersey, have invented certain new and useful Improvements inTypellriting Machines, of which thefollowing is a specification.

This invention relates to the carriage escapement mechanism oftypewriting machines, and particularly those of the Underwood type.

The object of the invention is to provide simple and inexpensive meanswhich mayreadily be applied to existing machines, for enabling theoperator at will to cause the carriage to move two letter spaces insteadof a single letter space at each type impression, or at each movement ofthe carriage escapement mechanism, for convenience in writing headings,or emphasizing words, etc.

The invention is illustrated in connection with the escapement mechanismdisclosed in United States Patent No. 769,804, in-which the loose orfeeding dog is given a positive diagonal movement during the returnstroke v mounted upon a device which is shiftable to enable said looseor feeding dog to spring past either one or two of the escapement teeth,at the will of the operator, according as a single or double s ace isrequired after the impression of each etter. Said dog stop ismounted bymeans of a lever upon a stationary part of the'machine, and said leveris connected by means of a link and rock shaft to a key or finger-pieceat theifront of the machine over the keyboard. The rock shaft preferablyhas a cam arm to vibrate said lever and force or lock it against stops,-

whichv limit its strokes.

Other-features and advantages will here-- inafter appear. i a

In the accompanying drawings, Figure 1 is a front perspective viewshowing my improvements applied to an Underwood front strike writingmachine; the parts being shown in position to cause double spaci g, ofthe carriage at the type stro t'e's Fig: t' is a diagrammatic plan toillu trat I ,e the operat1on seen at Fig. 1. Fig. view. similar the Fig.2 position. Fig. 5 is a View similar to Fig. 4, but. illustrating theparts in the Fig. 3 p0 ition. Fig. 6 is a perspective view of this apawl stop.

In said machine, tl'le power-driven carriage is provided with anescapement rack 1, which meshes with a pinion 2, ,the latter by means ofpawls 3 driving a toothed escapement wheel 4. A rocker 5,hung uponpivots 6 in a bracket 7, carries a detent dog 8, which is normallydisengaged from the escapement wheel 4, and also a loose or pivotedspacing dog or pawl 9. It will be understood that in. said machine'auniversal bar (not shown) vibrates at each type stroke, and has a partto engage an adjustable projection 10 .on the justable lever whichcarries .the

rocker 5, to push the same rearwardly to effect the proper cooperationof the feeding dogs and the escapement wheel. The loose dog 9 is pivotedat 11 on the rocker, to enable it to swing past the teeth of the escapement wheel, as soonas the rocker swings back far enough to liberate saidloose dog, A draw-spring 12, connected at its front end to a post 13 andextending diagonally to said loose dog, both causes the latter to swingpast the teeth of the escapement wheel 4, and also draws the rocker 5forwardly to initial position. The movement of the loose pawl 9 underthe tension of said spring is arrested by means of a stop consisting ofthe beveled shoulder portion 14 of a suitably mounted screw 15. Byreason of the bevel, the action of the pawl is brought underpropercontrol, as set forth in said Letters Patent.

The parts so far described are in common use on said Underwood machine.

I thread the stop-screw 15 into the rear end ofa stud 16 rojectingrearwardly from r the upper end of a lever 17, the latter pivoted at 18u on the bracket. 7, and its movement being imited by stops 19, 20formed upon'a plate 21 fixed to said bracket. The lever 17 is shiftedfrom side to side by me us as at Wig and at its left hand end it islongi- Fig. 4 y is a front elevation illustrating-the parts in of a link22, a rock-shaft 23 and keys 24, 2:)", M5

tudinally slotted at 28 to ride loosely upon the rear end of the rockshaft 23. A pin 29 projecting forwardly from the slotted .end of thelink, works in a cam slot 30 formed in an arm 31 secured upon the rockshaft 23. The cam slot is so shaped that as the arm is rocked up anddown, the link 22 is pulled or thrust endwise to shift the lever 1.? andthe stop-screw 15 thereon. At its ends the camslot is formed with lessinclined portions 32, to force the pin and link 22 tolnck the lever orits stud 16 against either one or the other of the stops 19, 20, so thatthere may be no I,

danger of the lever working loose and throwing the stop-screw 15 out ofposition. The

rock shaft 23 may be provided with an index 33, to point to numbers seenupon the machine frame 34, to indicate the number of 5 spaces thecarriage will move at each type i key operation.

When the operator desires to space the written letters widely, hedepresses the key 1 2 and 4, so that when the loose dog 9' is releasedfrom the escapement wheel tooth, it is drawn far enough to the left topass two of said teeth, as shown in said figures, so that when the dogrocker 5 resumes its normal position, the loose dog 9 will catch thenext Wheel tooth but one from that from which it just escaped, and hencethe escapement wheel and the carriage will be advanced-two letterspaces. This 0 aeration is repeated at every key stroke. Y hen theoperator desires to resume single or ordi- :cing, he depresses the key25, and the '1') n 29 is cammed to the right, and the leverl7 is lockedagainst the stop 20, with.

the screw 15 in the position seen at Figs. and 5, in which position theloose dog performs its ordinary single spacing. func- 'tion, escapingpast only one tooth of "the escapement wheel at each operation.

emcee Having thus described my invention, 1 claim:

1. In a typewriting machine, the combination with a carriage escapeinentwheel or rack, and a detent dog and a spacing dog therefor, of a springfor the spacing dog, a stop for the spacing dog, a lever on which saidstop is mounted, a link connected to said lever, a rock shaft havingcain connected to said link, and a finger-piece upon said rock shaft;means being provided to limit the strokes of the lever to enable thefeeding pawl'to vibrate pasteither one or two of the escapernent teeth.

2. In a typewriting machine,the combination with a carriage escapementwheel or rack, and a detentdog and a spacing dog therefor, of a springfor the spacing dog, a stop for the spacin dog, a lever on which saidstop is mounts a link connected to said lever, a rock shaft having a camconnected to said link, and a finger-piece upon said rock shaft; meansbeing provided to limit the strokes'of the lever to enable the feedingpawl to vibrate past. either one or tv. 0 of the escapement teeth; saidcam being;

rovided with means at its ends to incl-z the .ever at the extremes ofits vii ration.

3. In typewriting machine, the combination with a carriage escapementwheel or rack, and a detent don and. a spacing dog therefor, of a springtor the spacing dog, a stop for the spacing dog, a lever on which saidstop is mounted, a link connected to said lever, a rock shaf', having acam connected to said link, and a finger-piece upon said rock shaft;means being provided to limit the strokes of the lever to enable thefeeding pawl to vibrate past either one or two of the escapement teeth;said cam being I provided with means at its ends to lock the ever at theextremes of its vibration; said lever-arresting means including fixedstops against which the lever is forced by the locking portions of thecam.

JOHN C. MGLAUGHLIN. Witnesses:

K. FRANKFORT, JOHN =0. Samar.

